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Old 11-12-2010, 08:40 PM
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testing glow plugs

Hey guys I was woundering what is the easiest way to test the glow plugs in my 6.0l. And are the glow plows under the valve cover or on the outside of it? it was only 28 here today and i didn't want to start this morning

Thanks Jeff
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Old 11-13-2010, 03:10 PM
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check for DTCs first. usually if you have a bad glow plug, it will throw a DTC, but may not set the check engine light. Glow plugs are outside the valve cover. Takes about 20-30 minutes to change out the driver side, labor guide says 4 hours for the passenger side, all depends on motivation i guess lol. Also check your glow plug relay. They are pretty common on these engines and fairly easy to test. Connect a test light between the battery and the big terminal on the relay that the battery cable is going to. With the key on, engine off, the test light should illuminate. Hope this helps.
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Old 11-13-2010, 06:45 PM
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Yes it helps thanks for the response I found in the tech section how to test them. I didn't know if a glow plug was bad if it would throw a code so I will scan it. But also I didn't think th 6.0l had a glow plug relay do you know where it is? but now that i think about it last fall I had the same problem and it was the FICM so i will test that too. But I don't know if I'm going to try and fix it my self or not my boss works on little sewer cameras so i think he can solder it for me
Thanks Jeff
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Old 11-14-2010, 02:09 AM
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Something to bear in mind is a glow plug can test out ok electricaly but still not be working correctly. Heavy carbon buildup on the electrode will rob the efficentcy of the plug. Most of the heat generated will be absorbed by the carbon and will not reach the cylinder and block.

I recomend pulling and cleaning glow plugs at least once a year if the truck idles a lot.
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